"The 20-year-old midfielder made his Chelsea debut on the opening day of the Premier League season after impressing during our pre-season tour of Asia, and making his international debut for Ivory Coast earlier this summer.

"The talented and tricky Boga has helped us to win the Under-21 Premier League, the FA Youth Cup and UEFA Youth League, and has previously enjoyed loan spells in France and Spain."

Boga was born in Marseille to Ivorian parents, but joined the Blues academy at the age of 11 when his family relocated to London.

Despite representing France at Under-16 and 19 levels, he opted to play for the Ivory Coast at senior level, making his sole appearance to date as a substitute in the nation's African Cup of Nations qualifying defeat to Guinea in June.